Hi,

why do you lost a call? Are you sending 100 Trying before you put transaction 
to TSILO?

Bye,
Michal Popovič


> On 22 Apr 2020, at 07:58, German Cancio <[email protected]> wrote:
> 
> Dear All,
> 
> we are working on the integration of VoIP Push Notifications with iOS devices 
> via Kamailio. From what we observe, the time window between receiving a VoIP 
> APNS notification that wakes up the client app and the client app being sent 
> back to the background by iOS is extremely narrow. It is around 1-2 seconds, 
> with a (seemingly random) variance of say ~0.5s. 
> So 1-2s is the time window available for getting the client app to properly 
> REGISTER and to receive the INVITE back from Kamailio (using e.g. TSILO); 
> otherwise the call is lost. (On Android, the equivalent time window extends 
> to 10s or more.) 
> 
> Have others observed the same on iOS? We are using a client app that still 
> uses the iOS 12 SDK (with Xcode10). Can we expect changes in that regard with 
> iOS13/Xcode13?
> 
> many thanks and cheers, Germán
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